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      06-21-2017, 04:19 AM   #1
SimNugget
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Brake Calipers Turning Green

After a hot track session at Brands Hatch yesterday I have green/brown patches on my front brake calipers. Initial thoughts are it is residual brake fluid coming out of the bleed nipples (had a recent fluid change) as it looks to come from the bleed nipple area and work down. But it could just be heat.

Is there any way to get the colour back? I have washed the calipers but I fear I was too late.

My other bigger fear is the fluid is weeping from around the bleed nipple.

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      06-21-2017, 06:48 AM   #2
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After a track meet the other week

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      06-21-2017, 07:26 AM   #3
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Jees - yours look terrible!
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      06-21-2017, 08:04 AM   #4
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Hah, mine are dark, dark green. Almost black. 12 track days.
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      06-21-2017, 08:19 PM   #5
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The fluid leaking out happens when you don't clear the nipple of fluid after flushing. Spray water or brake cleaner in there after flushing if you care.

For the general puke green look, not much you can do. Delay it with extra cool down laps.
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      06-29-2017, 10:40 AM   #6
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My friend's early F80 calipers turned green and they replaced them. My F87 has not turned green but the fronts have darkened a good bit, however they are still blue. I've hammered on them with Pagid RSL1 and Hawk DTC70 on full slicks and NT01's in 95+ heat on some pretty hard braking tracks in TX.
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      06-29-2017, 12:24 PM   #7
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Was just getting ready to post about this. My front calipers have both changed color a medium turquoise color, the rear calipers a still blue. Running SRF and PF 08 pads.

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      06-29-2017, 07:20 PM   #8
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How come Porsche doesn't have this problem with their Brembo calipers?

I've seen this issue with the red 4-piston Brembo calipers on Evos and STi too...
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      06-29-2017, 07:23 PM   #9
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      06-29-2017, 11:06 PM   #10
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I'm wondering if it's the pad. I hear PFC 08s generate a lot of heat. Am going to try the 11's, altho, my calipers are already dark green.
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      06-30-2017, 05:51 AM   #11
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Pretty sure all brakes will eventually change color with track use. My red AP racing calipers on my e92 turned brown , as did my Stoptechs on my GTI.
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      06-30-2017, 05:57 AM   #12
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Porsche calipers seem to hold up their color very well regardless of heat???
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      06-30-2017, 06:15 AM   #13
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Quote:
Originally Posted by MagnusT View Post
Porsche calipers seem to hold up their color very well regardless of heat???
Probably they're not getting as hot as other calipers due to a working brake cooling concept.
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      10-31-2017, 02:19 AM   #14
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Mine did this over the weekend ? Any solutions ?
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      10-31-2017, 08:02 AM   #15
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At the BMW Experience event earlier this year all the M2s owned by BMW at the event had miscolored calipers
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      10-31-2017, 12:33 PM   #16
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Quote:
Originally Posted by MagnusT View Post
At the BMW Experience event earlier this year all the M2s owned by BMW at the event had miscolored calipers
So then what ? Just accept that they are green ?
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      10-31-2017, 02:06 PM   #17
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So then what ? Just accept that they are green ?
I've emailed BMW here in Sweden about it but they are oddly enough just ignoring my emails. I sent them a couple of follow up mails asking for a reply but no, nothing.
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      10-31-2017, 05:51 PM   #18
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Well I will change out my pads tomorrow and flush the brake fluid later this week, drive around a few weeks and then go have a chat to my dealership and see what they say. Else maybe I will have to look into refurb ... or save for BBK 🙌
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      10-31-2017, 09:29 PM   #19
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Mine started turning green by the fourth track day and are now well on their way towards black. Figure I'll try going to the dealer towards the end of the warranty period, otherwise they will just turn color again next year.
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      11-02-2017, 11:01 AM   #20
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Quote:
Originally Posted by lax01 View Post
How come Porsche doesn't have this problem with their Brembo calipers?
Because of their rear weight bias, the front rotors and calipers do a lot less work than your typical front engine setup. Plus they're typically lighter, thus less heat generated per brake application for the same amount of deceleration.

That and have you seen the fancy brake cooling ducts built into the control arms on even the basic model Porsche? THEY take owners tracking their cars seriously.
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      11-02-2017, 01:33 PM   #21
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Quote:
Originally Posted by kaosHunter View Post
So then what ? Just accept that they are green ?
you can always repaint them



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      11-02-2017, 04:33 PM   #22
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I like black... nice

Way better than the blue
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